Communications Systems Glossary

Ultra High Frequency (UHF).  The ultra-high-frequency (UHF) band is a radio-frequency (RF) band in the range 300-3,000 MHz.

Unbalanced transmission.  Unbalanced transmission is a transmission mode in which signals are transmitted on a single conductor and the return path for the current is through the ground.

Unconstrained Bit Rate (UBR).  Unconstrained bit rate is a service class for asynchronous transfer mode networks (ATM networks) in which the cell rate may be varied arbitrarily by a source.

Universal resource locator (URL).  The universal resource locator (URL) is the Internet standard for the specification of a file by defining the type of service as well as the location of the file.

Unshielded twisted pair (UTP).  Unshielded twisted pair cable is a form of twisted pair cable in which no separate shielding conductor is provided.

Uplink.  The uplink is the signal from a satellite ground station to the satellite transponder.

Upper sideband (USB).  When only one SSB sideband is transmitted, the transmission is called single-sideband suppressed carrier (SSBSC) or more commonly SSB.

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